/Engine/Source/Editor/UnrealEd/Public/FbxImporter.h
Empties the FBX scene, releasing its memory. Currently, we can't release KFbxSdkManager because Fbx Sdk2010.2 has a bug that FBX can only has one global sdkmanager. From Fbx Sdk2011, we can create multiple KFbxSdkManager, then we can release it.
void ReleaseScene()